643684464486346 has 32 divisors (see below), whose sum is σ = 967968733155840. Its totient is φ = 321029280936000.

The previous prime is 643684464486311. The next prime is 643684464486391.

643684464486346 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21902209420 + ... + 21902238808.

It is an arithmetic number, because the mean of its divisors is an integer number (30249022911120).

Almost surely, 2^{643684464486346} is an apocalyptic number.

643684464486346 is a deficient number, since it is larger than the sum of its proper divisors (324284268669494).

643684464486346 is a wasteful number, since it uses less digits than its factorization.

643684464486346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46510.

The product of its digits is 18345885696, while the sum is 76.

The spelling of 643684464486346 in words is "six hundred forty-three trillion, six hundred eighty-four billion, four hundred sixty-four million, four hundred eighty-six thousand, three hundred forty-six".